4. 形容词原级、比较级和最高级的用法：
(1)
两者比较情况一样，常用“as+形容词原级+as”句型。
He is as tall as
his monitor .
(2)
两者比较，表示一方在某方面不如另一方，常用“not so /as +形容词原级+as”句型。
A train doesn’t
travel so fast as a plane .
(3)
三者或三者以上比较，表示某人某物“最……”时，用“the+形容词最高级+比较范围”句型。
Asia is by far the largest of
the seven continents .
She writes (the)
most carefully of the three .
(4)
比较级+and+比较级“越来越……”
It is getting
cooler and cooler in autumn.
She is becoming
more and more active in taking part in social activities.
(5)
the +比较级，the +比较级“越……越……”
The harder he
studies , the greater progress he will make .
